Brake



L. E. LA BRIE Sept. 6, 1932.

BRAKE Filed Oct. 12, 1928 2 Sheets-Sheet m m T A NIL g m R E G D u LATTOR N EY Patented Sept. 6,1932

LUDGER n. LA BRIE, or sou'rn ,ZBENZD, INDIANA, ASSIGNOR TO BENDIX BRAKECOM} rm, OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKEApplication filed October 12, 1928. Serial No. 812,114.

This invention relates to brakes, and is illustrated as embodied in aninternal expanding automobilebrake of the three-shoe servo type. Anobject of the invention is to provide an improved anchorage permittingone or both of the anchored shoes to seat fully against the drum,preferably by allowing the heels of the shoes to move outward slightlytoward the drum.

With this object in view, the anchorage comprises a novel linkage, fullydescribed below, arranged to permit the desired shoe movement.Preferably the anchoring linkage engages the shoe between its ends, andthe end of the shoe nearest the anchor'is provided with novel stop meansfor determining its released position. In one desirable arrangement, anauxiliary shoe is pivoted to the shoe which is mounted on the anchoringlinkage,

so that the heels of the two shoes move in unison. The two illustratedforms of anchorlinkage also embody substantial novelty'in and ofthemselves. 7

The above and other objects and features of the invention, includingvarious novel and desirable details of construction, will be apparentfrom the following description of the illustrative embodiments shown inthe accompanying drawings, in which:

Figure 1 is a vertical section through the brake, just inside the headof the brake drum, and showin the brake shoes in side elevation;

Figure 2 1s a partial section on the line 22 of Figure 1, showing thebrake anchorage;

Figures 3, 4, and 5 are respectively partial sections on the lines 33,44, and 5'5 of Figure 2, showin in side elevation respectively theanchore end of the secondary shoe of the brake, the anchorage linkage,and the anchored end of the auxiliary shoe;

Figure 6 is a view corresponding to part of Figure 1, but showing onlythe anchored ends of the secondary and auxiliary shoes, with a modifiedlinkage Figure 7 is a partial section on the line 77 of Figure 6 showingthe brake anchorage;

Figures 8, 9-, and 10 are views corresponding respectively to Figures 3,4, and 5, but showingthe modification of F igui'e 6; and

Figure 11 is a partial section on the line 11-11 of Figure 1, showingthe connection between primary and secondary shoes.

The brake illustrated in Figure 1 includes a rotatable drum 10, at theopen side of which is a support such as a backing plate 12, and

within which is arranged the friction means of the brake. In thisparticular brake the friction means includes a primary shoe 14, ananchored secondary shoe 16 to which the primary shoe is connected bymeans such as a floating pivot 18, and an anchored auxiliary shoe 20.The secondary shoe 16-has a pair of spaced-stiffening webs straddlingthe ends of the webs of shoes 14 and 20, and the shoes 14 and 20 may ifdesired be interchangeable The secondary shoe is shown provided with asteady rest 22.

The brake is applied by means such as a double cam'24 forcmg shoes 14and 20 apart against the resistance of a return spring 26 tensionedbetween them, the secondary shoe 16 being applied by the primary shoe 14against the resistance of an auxiliary return spring 28.

Shoe 16 may be guided'during the application of the brake bypredetennining the path of shoe 14 to which it is connected. For

example, shoe '14 may be provided with an opening-or cam slot 30, theinner edge of which engages a guide .formed as a rounded lateralprojection 32 on the end of a stamped steel lever arm 34" securedfixedly but adjustably to the backing plate by a bolt 36 or the like,The upper end of spring 28 may be connected to the guide arm 34, asshown, or a se arate spring may be rovided if desired.

n the operation of t is device, the frst time the brake is applied afterinstallation, the bolt 36 is loosened so that the inner edge of slot 30may shift the guide arm 34 to its correctposition when the brake isapplied, spring 28 serving to hold projection 32 against the edge ofslot 30fduri'ng this time.

the released position 'of the anchored end of With the-brake so applied,bolt 36 is tightened, to preserve throughout the life of the brake theadjustment so made.

This guide is not claimed herein, as it is the invention of Roy S.Sanford and A. Y.

. Dodge, and is claimed in their applications Nos. 233,754, filed Nov.17, 1927, and 312,039

filed Oct. 12, 1928.

The present invention has to do with the anchorage of the brake. In'thearrangement of Figures 1-5, the secondary shoe 16, the

webs of which maybe reinforced by plates 40 welded to their sides, isanchored by being connected by a transverse pivot 42 to a pair of links44 between the webs ofthe shoe, which links in turn are pivoted on afixed an'-. chor 46 carried by the backing plate. .Anchor 46 may bepressed through one or a pair of reinforcing plates '48 bolted to thebacking plate.

In order to position the shoe 16 properly when the brake is released, itmay be formed at its end with radial slots 50 embracing the anchor 46,the shoe being urged away from the drum by a. spring 52 connected to itsend. Thus, as shown in Figure 3, the'outer ends of slots 50 serve ineffect as a stop determining shoes 16 and 20 are constrained to move.toward and from the drum in unison. The

harder shoes 14 and 16 wedge themselves against the drum when the brakeis applied with thecar moving forward and the drum turningcounter-clockwise, the more the heel of shoe 20 is forced outwardagainstthe drum, thus increasing the efiectivenex of shoe 20 andsupporting the drum against distortion.

In reverse, the angle of thrust of shoe 20 .on pivot 58 is such as totend to swing links.

44 outwardly, to. force the heels of shoes 16 and 20 against the drum,thus giving asubstantial servo effect even in reverse.

In the arrangement of Figures 6-10, in which many of the advantages ofthe abovedescribed arrangement are retained, the secondary shoe 16isdirectly pivoted on a fixed anchor pming through a relatively largeopening 72in shoe 20, while the auxiliary shoe 20 is anchored on shortlinks 74 pivoted on anchpr'70 and connectedto shoe 20. by a transversepivot .76.

The lower end of Shoe 20 is formed with a radial slot 78 embracing atransversepivot 80 carried by the spaced webs of shoe 16, and serving ineifect as a stop to determine the released position of the heel of shoe20.

The above-described arrangements are similar in some respects to thoseofPatent No. 1,566,954, granted December 22, 1925, of ap plication No.284,576, filed June 11, 1928, and of a plication No. 267 ,860,-filedApril 6, 1928. is not my intention to claim these .priorconstructions,or on the other hand to limit my invention to the particularembodiaments herein illustrated, or otherwise than by the terms of theappended claims.

I claim:

1. A brake comprising, in combination, a fixed anchor, I a shoe,angularly-movable means linking theshoe to said anchor, and an auxiliaryshoe on the opposite side of the anchor from the first shoe andpivotally connected to said first shoe in such a manner that. the torqueof both shoes is transmitted -to.the anchor by said means.

2. A brake comprising, in combination, a fixed anchor, a shoe,angularly-movable link members linking the shoe to said anchor, and anauxiliary shoe on the opposite' side of the anchor from the first shoeand piv otally connected to said "first shoe in such a manner that thetorque of both shoes is transmitted to the anchor by said link members.

3. A'brake comprising, in combination, a fixed anchor, a shoe,angularly-movable means linking the shoe to said anchor, and anauxiliary shoe pivotally connected to said first shoe adjacent itsanchored end in such a manner that the torque of both shoes istransmitted to the anchor by said means.

4.A brake comprising, in combination, a shoe, an anchor linkagepivotally connected to said shoe adjacent one end, an anchor for saidlinkage, and interconnected means between the shoe and anchor serving ineffect as a stop to limit the brake-releasing move- 1111181113 of theend of the shoe nearest said anc or.

I 5. A brake comprising, in combination, a shoe, an anchor linkagepivotally connected to said shoe between-its ends,-and an anchor forsaid linkage, a part of the shoe engaging said anchorand-serving ineffect as a stop to limit the brake-releasing movement of the end of theshoe nearest said anchor.

6. A brake comprising, in combination, an anchor, a shoe having 'aradial slot at its end movably embracing ,said anchor, andthrust-"transmitting means pivoted to an intermediate part ofthe shoeand mounted on said anchor.

7.- A brake comprising, in combination, an

anchor, a shoehaving a radial'slot at its end mo'v'ably. embracing saidanchor, thrusttransmitting means pivoted to an' intermediatepart of theshoe and mounted on said anchor, and an auxiliary shoe'on theop'msiteside of the anchor from the first shoe hairing a part extending past theanchor and connected to the first shoe.

8. A brake comprising, in combination, an anchor, a shoe having a radialslot at its end mova-bly embracing said anchor, and thrusttransmrttingmeans pivoted to an intermediate part of the shoe and mounted 'on saidanchor, together with a spring acting on the shoe and urging the slottedend inwardly as ed to the first s oe, together with a floating primaryshoe connected to the first shoe and applying means acting on theprimary and auxiliary shoe.

10. A brake comprising a shoe having an intermediate part linked to afixed anchor and having a slot receivin the anchor to serve as astop todetermine t e released position of the end of the shoenearest theanchor.

11. A brake comprising a shoe having an intermediate part linked to afixed anchor and having a slot receivin the anchor to serve as a stop todetermine t e released position of the end of the shoe nearest theanchor, together with a sprin urging said end of the shoe toward said reeased position.

12. A brake comprising, in combination, an anchor, a shoe hav ng spacedwebs formed at their ends with slots embracing said anchor, linksbetween said webs ivoted at their ends to the anchor and to the s oe,and an auxiliary shoe having a single web extending between said linksand connected to the spaced webs of the first shoe by a pivot extendingthrough enlarged openings in the links.

13. A brake comprising, in combination, an

anchor, a shoe having spaced webs formed at their ends with slotsembracing said anchor, links between said webs pivoted at their ends tothe anchor and to the shoe, and an auxiliary shoe having a single webextending between said links and connected to the first shoe.

14. A brake comprising, in combination, an anchor, a shoe having spacedwebs, links between said webs pivoted at their ends to the anchor and tothe shoe, and an auxiliary shoe having-a single web extending betweensaid links and connected to the spaced webs of the first shoe by a pivotextending through enlarged openings in the links.

15. A brake comprising two pivotally-connected overlapping shoes and alink serving as an anchorage for at least one of said shoes in bothforward and reverse braking.

16. A brake comprising two pivotally-connected overlapping shoe and alinkage serving as an anchorage for both of said shoes in both forwardand reverse braking.

17. Abrake comprising, in combination, an anchor, a shoe pivoted at oneend on the anchor, an auxiliary shoe on the other side 7 of the anchorfrom the first shoe and which is formed with a slot at its end, atransverse pin carried by the first shoe and extending through saidslot, and links pivotally connecting an intermediate part of theauxiliary (6 shoe to the anchor.

In testimony whereof, I have hereunto signed my name.

' LUDGER E. LA BRIE.

